diff --git a/Cargo.lock b/Cargo.lock
index 9ab3b1182..4dcabc8b2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6355,10 +6355,12 @@ dependencies = [
  "assert_matches",
  "bip32",
  "blake2b_simd",
+ "block-buffer 0.11.0-rc.3",
  "bs58",
  "chacha20poly1305",
  "core2",
  "criterion",
+ "crypto-common 0.2.0-rc.1",
  "document-features",
  "equihash",
  "ff",
diff --git a/Cargo.toml b/Cargo.toml
index 73e091c6e..2ca1597d7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -69,6 +69,8 @@ pasta_curves = "0.5"
 
 # - Transparent
 bip32 = { version = "=0.6.0-pre.1", default-features = false }
+block-buffer = { version = "=0.11.0-rc.3" } # later RCs require edition2024
+crypto-common = { version = "=0.2.0-rc.1" } # later RCs require edition2024
 ripemd = { version = "0.1", default-features = false }
 secp256k1 = { version = "0.29", default-features = false, features = ["alloc"] }
 transparent = { package = "zcash_transparent", version = "0.2", path = "zcash_transparent", default-features = false }
diff --git a/zcash_primitives/Cargo.toml b/zcash_primitives/Cargo.toml
index 5fd862354..bd15bb1d5 100644
--- a/zcash_primitives/Cargo.toml
+++ b/zcash_primitives/Cargo.toml
@@ -63,6 +63,8 @@ transparent.workspace = true
 # - Transparent inputs
 #   - `Error` type exposed
 bip32.workspace = true
+block-buffer.workspace = true # remove after edition2024 upgrade
+crypto-common.workspace = true # remove after edition2024 upgrade
 #   - `SecretKey` and `PublicKey` types exposed
 secp256k1 = { workspace = true, optional = true }